Improvement in permutation locks



D. L. TWEHv lmprovement'in Perm'utation Locks.

Patented Oct. 17,1871.

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@ummm NITED S DANIEL L. TOWER, OF NEW YORK, N. Y.

vIMPROVEMENT IN PERIVIUTATION LOCKS.

To all whom it may concern:

Be it known that I, DANIEL L. TOWER, of the city, county, and State ofNew York, have invented a new and useful Improvement in PermutationLocks, and I do hereby declare that the following is a full, clear, andexact description thereof, which will enable others skilled in the artto make and use the saine, reference being had to the accompanyingdrawing' forming part of this specification.

My invention consists in the improvement of permutation locks, ashereinafter described and subsequently pointed out in the claim.

In the drawing, Figure l, Sheet 1, represents a face view of the lockwith the bolt thrown forward. Fig. 2 is a view of the same, showing thebolt ready to be thrown back; also showing in dotted lines the positionofthe bolt when thrown back. Fig. 3 is a section looking` down from theline w x of Fig. 2. Fig. 4, Sheet 2, is a crosssection of Fig. 2 takenon the line y y. Fig. 5 is a view of one of the disk-wheels, with aportion broken away to show the manner of changing' the combination.Fig. G is a section of Fig. 5, taken on the line z z.

Similar letters ofreference indicate corresponding parts.

A represents the door. B is the case or shell of the lock. G is the knobof the lock by which the disk-wheels .are turned. D is the knob by whichthe bolt is thrown. E is the bolt. This bolt is made in two parts, Ebeing the bolt proper and F an end piece jointed thereto by a pivot,which allows it to be turned up at a right angle with E, as seen in Fig.2, preparatory to being thrown back. The two parts of the bolt arehalved together, and on the side of the piece F is the pinion G, (seeFig. 3;) also seen in dotted lines in Figs. 1 and 2. H is a rack, whichengages with the pinion connected at one end with the gear-wheel I. (SeeFigs. l and 2.) J represents the disk-wheels, two only being shownin thedrawing, but any desired number may be used. K is the shaftA upon whichthey are rotated. L is a gear-wheel on the shaft connected with the rstdisk J by screws m m. This iirst wheel J is a little`larger in diameterthan the jother wheels, so that the drop-bar will be held up by it clearof the other wheels when placing engages with the wheel L. P is a bar,upon one end of which the gear-wheel I is pivoted. The

other end ofthe bar is pivoted to the plate q of the shell, as seen inthe drawing. R is an arni reaching out from the bar P, upon the lowerend of which is a finger, S, (the end of which is seen in dots in Fig.2.) This nger enters the groove T in the side of the lirst disk-Wheelthrough the opening Z, and as the disk is revolved by turning the knob Cback the groove allows wheel I to drop into gear and operate the rackand pinion for throwing up the end F of the bolt. This is done when thedisk-wheels have all been properly placed according to the combinationfor unlocking. U is a dial-plate on the door, under the knob O, afinger, c, being attached to the shank ofthe knob to guide the operatorin moving the disk-wheels. The bolt E is thrown by turning the knob D. Dis a disk 011 the shank of this knob, in which is a pin, seen in dottedlines in Fig. 3, which enters a slot in the bolt and throws the boltbackward or forward by a crank motion. In the sides ofthe disk-wheelsare pins c, which come in contact with each other in placing' the disksto form the combination. The disk-wheels are made in two parts or withcentral movable disks d, to which the pins e are attached. These innerdisks are held in any desired position. The combination is changed bymoving them, and thus changing the position of the pins e; and they areheld by means of cam-grooves in the small keywheels f and the plates g,which plates are thrown by the cam in contact with the edges of theinner disks d, and thus firmly holding the disks and pins e stationaryin the disks J until another changeV in the combination is desired. Theconstruction of these inner movable disks el, and the manner in whichthey are confined in and make a portion of the disk J, is plainly seenin Fig. 6. The cani-fastening above described is seen in Fig. 5. In theperiphery of each outer disk (be they more or less in nrmiber) is a slotor notch, into which the arm It drops when the disks have all beenplaced according to the combination. The arm It extends out over all thedisks and drops by its own gravity when the notches allow it; and, asbefore stated,'when it drops the gearwheel I drops into gear with thewheel L 5 vthe nger S enters the groove T and is held down by thegroove, when a slight back movement of the knob throws up the end F ofthe bolt and allows the bolt to be thrown back, thus unlocking the door.The bolt F is supported by the bracket W on the inside of the door. Xrepresents spring staples connected with the disks J at the ends oftheir legs. There are grooves in the shaft K, between the disks, whichreceive the legs, thus producing` sufficient friction 011 the shaft tokeep the disks steady while they prevent friction between the disks. 1

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. In combination with jointed bolt E F the pinion G,rack-bar H, pinion I, bar P having Witnesses GEORGE W. MABEE,

T. B. MosHER. (93)

